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Inhibition of the Wnt/beta-catenin pathway by the WWOX tumor suppressor protein

N Bouteille1, K Driouch, P El Hage

  • 1Centre René Huguenin, FNCLCC, St-Cloud, France.

Oncogene
|May 26, 2009
PubMed

Insights

The WWOX tumor suppressor protein inhibits the Wnt/beta-catenin pathway by interacting with Dishevelled proteins. This interaction prevents Dishevelled from entering the nucleus, thereby blocking Wnt signaling.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • The WWOX gene encodes a tumor suppressor protein (WWOX) involved in various diseases, including cancer.
  • Understanding WWOX's molecular functions requires identifying its interacting partners and pathways.

Purpose of the Study:

  • To investigate novel protein interactions of WWOX.
  • To elucidate the role of WWOX in the Wnt/beta-catenin signaling pathway.

Main Methods:

  • Yeast two-hybrid system to identify protein interactions.
  • Coimmunoprecipitation assays to confirm physical association.
  • Assays measuring Wnt/beta-catenin transcriptional activity.
  • Western blotting to assess beta-catenin stability.

Main Results:

  • Identified a physical association between WWOX and Dishevelled (Dvl) proteins.
  • Demonstrated that WWOX inhibits Wnt/beta-catenin pathway activity.
  • Showed that WWOX prevents the nuclear translocation of Dvl proteins, sequestering them in the cytoplasm.
  • Observed that WWOX affects beta-catenin stability and Wnt-3a-induced signaling.

Conclusions:

  • WWOX acts as a novel inhibitor of the Wnt/beta-catenin pathway.
  • WWOX's inhibitory mechanism involves preventing Dvl nuclear import.
  • These findings offer new insights into WWOX's tumor-suppressive functions and Wnt pathway regulation.

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